RT Journal A1 Khaodhiar L, Bistrian BR T1 TOtal parenteral nutrition for critically ill patients JF JAMA JO JAMA YR 1999 FD October 20 VO 282 IS 15 SP 1423 OP 1425 DO 10-1001/pubs.JAMA-ISSN-0098-7484-282-15-jac90009 UL http://dx.doi.org/10-1001/pubs.JAMA-ISSN-0098-7484-282-15-jac90009 AB To the Editor: The meta-analysis of total parenteral nutrition (TPN) in the critically ill patient by Dr Heyland and colleagues1 illustrates several of the serious problems of meta-analysis compared with randomized clinical trials. These involve heterogeneity of the trials included, failure of the investigators performing the meta-analysis to understand the basic issues, and defects in abstracting.2 Several problems illustrate why there should be a reluctance to base clinical decisions about the use of TPN on the distilled findings from this meta-analysis.